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Mike Benvo · #9 10-22-2011, 05:37 PM

Quote:

Originally Posted by JCL

Never heard any pinging on any recent BMW, on 87 or 89. The DME is operating at the speed of sound; there isn't an adaptation period in my experience.

Do you tune ECU's?

Do you know how minimum ignition maps work on this particular DME family?

Do you know about target based systems, and how this works in conjunction with minimum timing maps when you change the targeted timing?

I wouldn't make statements that the "DME is operating at the speed of sound" when that is not of relevance in this particular case. I could go into processor architecture here, but that's a whole different case. And were talking about faster than the speed of sound.. these are electrical signals.

There are so many different adaptations - over 20 of them. Do you think that the DME can pull timing infinitely? It can't. It will to a certain point.

If you go from higher octane to lower octane, there is a chance it will ping until it makes corrections to prevent it from happening.

On some E46 M3's we REMOVE timing from stock in certain areas due to the factory timing maps being too far advanced in certain areas for 91 octane piss water fuel.

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